CVE-2026-100263CWE-79cross-site-scripting

CVE-2026-100263

Medium · published September 30, 2026

CVSS v3.1
4.7
EPSS
0%
Percentile
8.4
In the wild
Unconfirmed
What it is

In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00192 · 8.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-30T20:16Z
Affected products (1)
ProductVersionsFixed in
jetbrains/youtrack< 2026.2.189912026.2.18991
References (1)
https://www.jetbrains.com/privacy-security/issues-fixed/ · [email protected]
EPSS history
Timeline
  • 02 OCT 03:41Z
    EPSS moved — → 0%
    epss
  • 30 SEP 15:17Z
    In JetBrains YouTrack before 2026.2.18991 stored HTML injection via the User-Agent header was possible
    cvelistv5